Abstract:

We systematically study the optical spectra of ZnO grown by atomic-layer
deposition as a function of Al (and Ti) doping concentration. The
spectra measured on films are well described by fits using a Drude
free-electron model. The derived plasma frequencies are consistent with
the expected amount of doping and can be continuously and controllably
tuned from small values to about 400 THz. The losses (damping) are also
quantified. In addition, we achieve smooth conformal coatings of
three-dimensional polymer templates made by direct laser writing.
Altogether, Al:ZnO appears as an attractive “tunable metal” for
three-dimensional infrared metamaterials or transformation-optics
architectures.

last change:
2011-08-09 KIT – The Research University in the Helmholtz Association